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+;;; emms-history.el -- save all playlists when exiting emacs
+
+;; Copyright (C) 2006, 2007 Free Software Foundation, Inc.
+;;
+;; Author: Ye Wenbin <wenbinye@163.com>
+
+;; This file is part of EMMS.
+
+;; This program is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation; either version 3, or (at your option)
+;; any later version.
+;;
+;; This program is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+;;
+;; You should have received a copy of the GNU General Public License
+;; along with this program; if not, write to the Free Software
+;; Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+;;; Commentary:
+
+;; Saves all playlists when you close emacs.  When you start it up again use
+;; M-x emms-history-load to restore all saved playlists.
+
+;; To use it put the following into your ~/.emacs:
+;;
+;;   (require 'emms-history)
+;;
+;; If all playlists should be restored on startup add this, too:
+;;
+;;   (emms-history-load)
+
+;;; Code:
+
+(require 'emms)
+(eval-when-compile
+  (require 'cl))
+
+(defgroup emms-history nil
+  "Saving and restoring all playlists when closing/restarting
+Emacs."
+  :prefix "emms-history-"
+  :group 'emms)
+
+(defcustom emms-history-file (concat (file-name-as-directory emms-directory) "history")
+  "The file to save playlists in."
+  :type   'string
+  :group  'emms-history)
+
+(defcustom emms-history-start-playing nil
+  "If non-nil emms starts playing the current track after
+`emms-history-load' was invoked."
+  :type   'boolean
+  :group  'emms-history)
+
+(defun emms-history-save ()
+  "Save all playlists that are open in this Emacs session."
+  (interactive)
+  (when (stringp emms-history-file)
+    (let ((oldbuf emms-playlist-buffer)
+          ;; print with no limit
+          print-length print-level
+          emms-playlist-buffer playlists)
+      (save-excursion
+        (dolist (buf (emms-playlist-buffer-list))
+          (set-buffer buf)
+          (when (> (buffer-size) 0) ; make sure there is track in the buffer
+            (setq emms-playlist-buffer buf
+                  playlists
+                  (cons
+                   (list (buffer-name)
+                         (or
+                          (and emms-playlist-selected-marker
+                               (marker-position emms-playlist-selected-marker))
+                          (point-min))
+                         (save-restriction
+                           (widen)
+                           (nreverse
+                            (emms-playlist-tracks-in-region (point-min)
+                                                            (point-max)))))
+                   playlists))))
+        (with-temp-buffer
+          (insert "(\n;; active playlist\n")
+          (prin1 (buffer-name oldbuf) (current-buffer))
+          (insert "\n;; playlists: ((BUFFER_NAME SELECT_POSITION TRACKS) ...)\n")
+          (prin1 playlists (current-buffer))
+          (insert "\n;; play method\n")
+          (prin1 `((emms-repeat-track . ,emms-repeat-track)
+                   (emms-repeat-playlist . ,emms-repeat-playlist))
+                 (current-buffer))
+          (insert "\n)")
+          (write-file emms-history-file))))))
+
+(add-hook 'kill-emacs-hook 'emms-history-save)
+
+(defun emms-history-load ()
+  "Restore all playlists in `emms-history-file'."
+  (interactive)
+  (when (and (stringp emms-history-file)
+             (file-exists-p emms-history-file))
+    (let (history buf)
+      (with-temp-buffer
+        (insert-file-contents emms-history-file)
+        (setq history (read (current-buffer)))
+        (dolist (playlist (cadr history))
+          (with-current-buffer (emms-playlist-new (car playlist))
+            (setq emms-playlist-buffer (current-buffer))
+            (if (string= (car playlist) (car history))
+                (setq buf (current-buffer)))
+            (mapc 'emms-playlist-insert-track
+                  (nth 2 playlist))
+            (ignore-errors
+              (emms-playlist-select (cadr playlist)))))
+        (setq emms-playlist-buffer buf)
+        (dolist (method (nth 2 history))
+          (set (car method) (cdr method)))
+        (ignore-errors
+          (when emms-history-start-playing
+            (emms-start)))))))
+
+(provide 'emms-history)
+;;; emms-history.el ends here